Abstract The research on the propagation characteristics of underwater explosion signals is of great value to the safety of ocean engineering and military defense. Based on the theories of fluid dynamics and acoustics, combined with numerical simulation and experimental data, the influence mechanism of water depth, charge mass, and continuous explosion conditions on the underwater explosion signal is systematically analyzed. The results show that the increase of water depth can significantly increase the peak pressure of shock wave (about 5% increase in 1000 m water depth compared with 100m water depth), while accelerating the pressure decay, which is due to the suppression of bubble expansion by deep water static pressure, and promote more energy to be converted into shock wave mechanical energy. The verification error of Cole’s empirical formula is less than 10%, which confirms the reliability of the water depth effect. The charge mass dominates the near-field shock wave intensity through the scaling law, and the mass effect decays with distance. In the continuous explosion, the time interval (Δt) regulates the superposition effect of the shock wave: the short interval (Δt = 5 ms) forms a “plateau pressure zone”, the peak pressure increases by 32% compared with the working condition of Δt = 20 ms, and the high-frequency energy (12 – 20 kHz) increases by 8 – 10 dB; the long interval (Δt > 15 ms) induces the low-frequency secondary pulse, which is easy to excite the structural resonance.
Hu et al. (Fri,) studied this question.